Valve for hydraulic elevators



(No Model.)

J. P. DAVIS. VALVE FOR HYDRAULIC ELBVATORS.

N0. 604,230. Patented May 17,1898.

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INVENTUH I/VTNESHEB ilNrrn STATES PATENT rrrcn,n

JENKIN P. DAVIS, OF LUDLOW, r`KENTUCKY, ASSIGNOR TO THE WARNER ELEVATOR MANUFACTURING COMPANY, OF CINCINNATI, OHIO;

VALVE FOR HYDRAULIC ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 604,230, dated May 17, 1898.

Application tiled September 27 1897` Serial No. 653,101. (No model) To all whom t may concern:

Be it known that I, JENKIN P. DAVIS, a citizen of the United States, and a resident of Ludlow, in the county of Kenton and State of Kentucky, have invented certain new and useful Improvements in Valves for Hydraulic Elevators, of which the following is a specification.

My invention relates to hydraulic-elevator valves, in which the main valve is operated by an auxiliary or pilot valve.

The main object of the invention is to provide acompact, simple, and reliable means to gradually stop and start the car and prevent the car from moving in either direction after it has been Astopped until the operator actuates the valve-controlling mechanism in the car. The means by which I attain these and other minor objects of my invention are fully illustrated in the accompanying drawings, in connection with which the invention will be first fully described, and then particularly referred to and pointed out inthe claims.

Referring to the drawings, in which like parts are indicated by similar reference-letters wherever they occur throughout the various views, Figure l is a central longitudinal sectional View through the main and pilot valves and their seats, the connecting-pipes and operating mechanism being shown partly in section and partly in side elevation. Fig. 2 is an enlarged detail View, in central longitudinal section, through the auxiliary or pilot valve.

Describing rst the main valve, A is abrass tube, which forms the seat for the main valve. This passes through chambered heads B, C, and D and is perforated or slotted within the chambers of these heads, B being the head of the supply-pipe,leading from the water-main, Cthe head of the pipe leading to the elevator, cylinder, and D the head of the exhaust-pipe, leading to the sewer. These heads have annular flanges surrounding the cylinder C to receive elastic packing-rings or gaskets a to prevent leakage of water from the pipe-heads. Upon the opposite ends of the cylinder A are secured annular flanges A', which are also recessed around the tube to receive packingrings a. The ianges A are preferably provided with annular rabbets to seat the annular peripheral rings of the heads A2 and A3 which are secured to the flanges by bolts a', any suitable packing being interposed to form water-tight joints.

vThe cylinder A is provided with three pistonsE, E, and E2, the end pistons E and EZ being the same in construction, and the central piston E diifering onlyin having the central metal body, against the opposite ends of which the cup leathers are clamped instead of being clamped back to back, as in pistons E and E2. These pistons are of ordinary construction, the only novelty being in the manner in which they are clamped upon the piston-rod e by means of the tubular sections e', the spade-handle head e2, and the nuts e3, the piston-rod being made to it snugly the central bore in the valves,the tubular sections c being sleeved over the pistons and the pistons clamped tightly between the head e2 and the outer metal disk of the piston E by the nuts e3.

The head AZ has a central recessed boss to receive the nuts e3, so as to allow full play of the piston E. The head A3 is centrally bored to pass the piston-rods e e', and surrounding thewbore is a central] y-bored head to receive a packing-gland a2. The head A3 has preferably cast integral with it a standard a3 to support the bearings of the valve-actuating mechanism.

The pilot-valve is secured on the head B of the ysupply-pipe. It consist-s of the casting F, which in casting is cored out to form the supply-ports f, the ports connecting the valve with each end of the cylinder A by the pipes and theirconnectionsf, and the exhaust-port f2, which is connected by the pipe f3 to the head D, leading to the sewer. The ends of the valve case or seat F are turnedl off true and centrally bored to receive the double pistons G, which barely cover, when in their central position, as shown, the supply-ports f, and have lugs or wings g formed upon their opposite sides to guide the pistons truly in their seat, the seat being also chambered around the pistons to the supply-ports f to allow the free discharge of the water when the piston is moved in either direction to uncover the ports. The ends of the valve-case are closed by heads f4 and f5, the head f5 be- Ioo ing centrally bored to pass the piston-rod g and counterbored to receive the packinggland nut g2.

The pistons G and rod g are preferably formed integral and of gun-metal or bronze, at least so much of the piston as plays through thehead f5 and extends beyondit suflicient to connect with the rod g3 and the enlarged rod g4, both of which are continuations of the piston-rod. The part g4 slides through a bore` in the upper end of the standard a3 and is provided at its end with a spade-handle joint g5, which connects it to the link t of the valve-operating mechanism, which consists. of the rocking lever I-I, whichis journaled in the standard a3, connected at its upper end by a link h to the link a and operated by a lever-bar h2 by means of ropes or cables h3, which extend up into the elevator-cab and are connected to the customary operating mechanism. The link 7L is connected to the piston-rods e and e' by a bolt e4,passing through the lugs or sides of the spade-handle head e2 and through an elongated slot in the lower endof the link h, the bolt e4 being the fulcrum of the lever mechanism for actuating the valves.

The operation of the device is as follows: Assuming the parts to be in the position show-n in the drawings, the elevator-cab is at rest. If it is desired to move the cab upwardly, which is done by turning the supply of water i-n-to the cylinder-head C, the leverH is rocked to the left, carrying the pistons G also to the left, opening` the supply-port f and admitting water through the head A2 of the cylinder A. This movement also exerts pressure upon the fulcrum e4, which tends to move the pistons of the main valve to the right, opening cornmunication between the heads B and C. If it is desired that the elevator should descend, the lever H is rocked to the right, opening communication between the supply-port of the pilot-valve through the head A3, and against the end of the cylinder E2, opening .communication between the cylinder and the exhaust-head D. The movement of the pilotvalve in this direction also tends to start the main pistons to the left. In either case the movement of the valve would be gradual until the lap of the main valve fully uncovers the ports in the cylinder A.

Should there be any leakage of the pilotvalve, which would be in any event vvery slight, its pressure would be fully exerted upon the outer ends of the valves E' and E2 and there would be no tendency of the main valve to move in either direction; but should the leakage be greater upon one side of the piston G than the other and tend to move the main pistons in either direction the action of the pistons would move the pilot-valve in the same direction and equalize the pressure before any of the ports in cylinder A would be uncovered. To prevent any Waste through the exhaust-port of the pilot-valve during the night or when the elevator is not in use, the pipe f3 is provided with avalve f6, which will regulate communication between the pilotvalve and the head D.

What I claim is- 1. In a valve for hydraulic elevators the combination of the main-valve cylinder or seat having closed ends and perforated in the chambered heads of the main supply-pipe, the pipe leading to the elevator-cylinder and the exhaust leading to the sewer, the valves controlling the supply and exhaust from said heads and having a stem extending through one end of the cylinder or seat, the pilotvalve for operating said main valves communicating with the supply from the main through the head of the main supply and having its exhaust communicating with the head of the discharge or sewer pipe and having supply-ports communicating with each end of the main-valve cylinder, connected piston-valves controlling the supply and exhaust ports o f the pilot-valve,`said pistons barely covering the openings of the supplyvalve and having guide-wings upon each end and a stem extending through the pilot-valve case, the link connected to the pilot-valve stem and main-valvestem, a rocking lever, a link connecting the rockin glever and the link to which both valve-stems are connected, and the cross-lever having ropes or cables extending into the car Yfor actuating the rocking lever and moving the pilot-valve and main valve in either direction or stopping it in the center, substantially as shown and described.

2, The hereinbefore-described pilot-valve for hydraulic elevators, consisting of the case having a central receiving-port to connect with the Water-main, supply-ports upon each side thereof and the exhaust-ports having a central discharge, a bored seat communicatin g with said ports, a double piston-valve fitting said bore, controlling the supply-ports, barely covering the same without lapping and having guide-wings upon their ends, the stem of said valve extending through the end of the case to be connected to operating mechanism, and the heads closing the ends of said valvecase, combined and arranged substantially as set forth.

JENKIN P. DAVIS.

Witnesses:

W. F. MURRAY, Guo. J. MURRAY.

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